Improvement in sewing-machines



I. S.- MCCURY.

Sewing Machine.

No. 26.234.- l i Patented Nov.' 22, 1859.

N. PETERS. Prwwmhnmw. wzmmgmn. Dv C.

UNITED STATES PATENT OFFICE.

JAs. s. MCOURDY, OF BROOKLYN, AssieNonTO J. OF Nnw YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 26,234. dated November22, 1859.

To all whom, it may concern Be it known that I, J AMEs S. MOCURDY, ofBrooklyn, in the county of Kings and 'State of New York, have invented,made, and applied to use certain new and useful Improvements inSewing-Machines; and I do hereby declare that the following is a full,clear, and exact description of the construction and operation of thesame, reference being had to the annexed drawings, making part of thisspecification, wherein- Figure 1 is an end view of my machine. Fig. 2 isa view of the shuttle-driver transversely of the bed. Fig. 3 isa sideview of the shuttle-driver and feeding device, the bed being in sectionand Fig. 4 is a section of the spool-carrier.

Similar marks of reference indicate the same parts.

The nature of my said invention consists in a compound shuttle-driver-that acts in a very reliable manner in giving the right motion and atthe right time to the shuttle, avoiding the wear on the shuttle-drivernow usual, and consequently insuring a continuance of the proper timingbetween the needle and shuttle.

In the drawings, a is the bed of the machine.

b is the arm, carrying the pressure-foot c and needle-bar d, as usual.

e is a shaft rotated by competent power, and communicating areciprocating movement to the needle-bar d and needle, as usual. On theend of this shaft e is a disk or crank, f, carrying a pin that works ina slot (shown by dotted lines in Fig. 2) in the back of a vibratinglever, g, that is attached by and moves on a pin, 1, attached to thebed. In this lever g is a hole through which the pin h of theshuttle-driver passes, and i is the nger coming up behind the shuttle todrive the same.

k is a spring tending to keep the pint' down onto the raceway Z, inwhich the shuttle travels. By reference to Figs. 2 and 8 the operationof this shuttle-driver will be understood, as follewszJThe lever g isvibrated by the pin of the disk f, traveling in the slot of said lever,and the spring k is compressed as the shuttledriver h is drawn out ofsaid lever g. rlhis operation checks the momentum of the shuttlc-driverand lever as the crank-pin passes the center, and said spring 7caccelerates o1 aids in starting and propelling the shuttle. Thus themovement is more uniform, noiseless, and reliable, because that thumpingand wear consequent upon suddenly arresting and reversing the motion ofthe shuttle-driver is avoided, and none of the parts are liable to wearloose and effect any variation in the rela-V tive movements of theneedle and shuttle.

m is a feeding-wheel attached to the bed by a center pin, 2, that can beadjusted vertically to regulate the amount said feed-wheel projects fromthe bed, and n is a spring pressed onto the flat side of said feedwheelm to hold the same steady on the back movement of the feeding mechanism,next described. 0n the side of the wheel m is a hub or diverging ring,as seen in Fig. 3, over which a circular clamp, p, sets. This isprovided with two binding-blocks, 3 and 4, and the pawl o,.that isattached by the screw 5 and kept to the hub a? by the spring 6.

7 is a spring tending to keep the lever p of the clamp p toward a toe,q, on the short rockshaft r, on which is a lever, s, that is operated onby-a cam, t, on the main shaft e.

The operation of this feeding device is as follows: Vhen the toe qpresses on the lever p', the pawl o clamps and binds against the flaringor diverging ring x, which draws the blocks 3 and 4 down onto the saidring, the divergence of which causes the faces of said blocks to pressagainst tai-e face of the feedwheel m, producing a binding frictionalmost to the periphery of Said feed-wheel, insuring that the feed-wheelwill be turned the given distance; but so soon as the pressure of thetoe g is released, the spring 7 draws back the lever p', the movement ofwhich releases the pawl o in consequence ofits slightly-inclinedposition, and the parts are relieved and turn freely O11 the feed-wheel,around the hub x, the distance regulated for the stitch, whichregulation is effected by the incline 8 and adjusting-screw u. Thespring u prevents the feed-wheel turning back by any slight friction,and the spring 9 lifts the toe when not acted on by the cam t.

The spool of thread for the needle (shown at ru in Figs. l and 4)ismounted on a spindle, 10, and clamped thereto by nuts l1; and thisspindle is sustained on points in a frame, w.

One of these points is tted to slide in a cavity and kept up by a spring12. The other point is adjusted by the set-screw and nuts 18. The spring12 s sufficient for resisting the screw 13 in regulating the tension;but When one spool is to be taken outvand another substituted, it ean beeffected Without changing the tension, because the spring` 12 and pointcan be coinpressed suffioiently to allow the other end of the spindle toclear the point 13.

Having` thus described my said invention7 what I claim7 and desire tosecure by Letters Patent, is-

JAMES s. MCGURDY.

Vitne-s'sehsz-u I LEMUEL W. SERRELL, THos. Gno. HAROLD.

